Where exactly did this insult come from? It doesn't even make sense, in some cases. For instance, I'm forced to breathe through my mouth due to sinus damage from a cleft palate.
So, where did this come from? Why is it considered an insult? If it's referencing an injury, is it right to use it?
So, where did this come from? Why is it considered an insult? If it's referencing an injury, is it right to use it?